Does anyone have any information on decoding Yahoo Mail Message-IDs?
Thanks in advance
Have you read https://www.forensicswiki.org/wiki/Yahoo!_Mail_Header_Format
As a second thought, Ron, if the above is not enough have you seen these
Al-Zarouni.pdf - https://www.dropbox.com/s/eejtlfc5iq8u5oa/Al-Zarouni.pdf?
There is also this webpage where you can copy and paste header details - https://mailheader.org/
Thanks for that Greg, very useful. R